Artificial stone.



Ifiese mgredients are thoroughly mixed in two pounds of co eras one pound of co er 3 sulfate one pound each of chromic alum 106. COMPOSITIONS,

COATING OR PLASTIC.

UNITED a i rEs v PATENT ERNEST D. REED, OF ANN ARBOR, MICHIGAN, ASSIGNOR TO ROYAL S.

COPELAND, TRUSTEE, OF

ANN ARBOR, MICHIGAN.

ARTIFICIAL STONE.

SPECIFICATION forming part of Letters Patent No. 773,421, dated October 25, 1904. Application filed March 21,1904. Serial No- 199,200. (No specimens.)

To all whom it may concern:

Be it known that I, ERNEST D. REED, a citizen of the United States, residing at Ann Arbor, in the county of Washtenaw and State of 5 Michigan, have invented certain new and useful Improvements in Artificial Stone, of which the following is a specification.

The invention consists in a new composition of matter for artificial stone and in the processof making the same, as hereinafter described.

In carrying out the process I employ as the base of t e composition sand, cement, and lime in the proportions of about one to ten parts of sand one part of cement and one part lime.

any suitable manner in their dry state and then moistened with a liquid mixture hereinafter described to form a plastic mass, which may be molded into the article-or articles desired. The moistening mixture is formed by dissolving in about forty gallons'of water co peras, copper sulfate, chromic alum manganese chlorid lithar 'e and potassium car- Bonate and addlng to this solution sodlum 5 silicate. Theproportions ofthesemetalsmay evarled within certain limits; but I have found that the best results are obtained by using with the amount of water specified about A fmanganese chlgng lithar e an o assium camona e an a 0M pounds of the mhe metals form insoluble silicates y uni mg with the sodium silicate and serve to cement the sand particles. Furthermore, by using a large number and variety of metals.

' as set forth, a corresponding number and variety of insoluble silicates are produced,which add materially to the tensile strength and dura- 4 bility of the product. To the liquid mixture thus formed is added enough of a mixture of otassium bichromatc and sulfuric acid to neu ra ize ie a a 1. his as e e cc of hastening the maturing of the product by a strong oxidizing agent and liberatessilicic acid, which combines with the bases present in the dry mixture and further assists in cementing the particles. Calcium fluorid and sulfuric acid in the proportions of afiout one- 0 fourth pound of the former to about three- 5 tenths of a pound of the acid are then added to the neutralized mixture, the hydrofluoric acid liberated by the reaction acting upon the' sand, causing it to enter into chemical combination with the bases present in the two mixtures.

; --The mixed sand, cement, and lime is thoroughly moistened with the liquid mixture described until a plastic mass is produced, which is molded,as previously described, and allowed to stand and set.

I may and preferably do subject the composition while curing to a wash or ba th for the purpose of hardenin'g tli' fi'difipound.

This wash is composed of about ten pounds 5 of hydrofluo-silicic acid, about four pounds of acetic acid, and approximately twenty five gallons of water.

The compound while in the plastic state is sprinkled or moistened at intervals of eighteen 7 ter consisting of sand, cement and lime mois- 5 t'ened with a neutralized mixture of water, copperas, copper sulfate, chromic alum, manganese chlorid, litharge, potassium'carbonate, diu silicate, calcium fluorid and sulfuric I washed with an acetic-acid solution containing hydrofluo-silicic acid.

3. The herein-described process of making artificial stone which consists in mixing sand, cement and lime while in the dry state, in mixing together water, copperas, copper sulfate, chromic alum, manganese chlorid, lith- .arge, potassium carbonate and sodium silicate osition while curing being 9 uid mixture with a mixture of sulfuric acid and potassium bichromate, in then adding to 5 the neutralized mixture calcium fluorid and sulfuric acid, then mingling the dry and liquid mixtures to produce a plastic mass, and finally treating at intervals the plastic compound thus formed with an acetic-acid solution containing hydrofiuo-silicic acid.

In testimony whereof I aflix my signature in presence of two witnesses.

V ERNEST D. REED. Witnesses:

J AS. PQBARRY, H. 0. SMITH. 

